Stator

Abstract

To provide a stator in which processing a portion corresponding to a coil end portion of a segment coil can be facilitated.SOLUTION: In a stator 100, a plurality of coil end potions 20b each include a slot-side inclined portion 21 having a connection portion 21a connected to a slot housing portion 20a, and a tangential direction inclined portion 21b inclined in a tangential direction of a stator core 1 with respect to the stator core 1 in an axis direction view, and extending outward in the axis direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a stator, and more particularly to a stator including a coil. [Background technology]

[0002] BACKGROUND ART Conventionally, a stator having a coil is known (for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a stator for a rotating electric machine that includes an annular stator core with a plurality of slots and a coil inserted into the slots. In Patent Document 1, the coil is formed in an arc shape along the inner peripheral surface of the stator core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-225974 Summary of the Invention [Problem to be solved by the invention]

[0005] As disclosed in Patent Document 1, when forming a coil into an arc shape that follows the inner circumferential surface of the stator core, the coil end portions of the segment coils that form the coil, which protrude from the stator core, must also be formed into an arc shape. However, since forming a segment coil into an arc shape is not easy in terms of the manufacturing process when the dimensions are small, in order to make it easier to form the arc shape, the dimensions may be designed to be large, and then the coil end portions may be formed into an arc shape and then reduced in size. In this case, processing the portions of the segment coil that correspond to the coil end portions is time-consuming, so it is desirable to make it easier to process the portions of the segment coil that correspond to the coil end portions.

[0006] This invention has been made to solve the above-mentioned problems, and one object of this invention is to provide a stator that makes it possible to easily process the parts corresponding to the coil end portions of the segment coils. [Means for solving the problem]

[0007] In order to achieve the above object, a stator in one aspect of the present invention comprises a stator core including a slot, a slot accommodating portion inserted into the slot, and a coil including a plurality of coil end portions protruding axially outward from the end face of the stator core, the coil being made of flat wire and formed by joining a plurality of U-shaped segment coils together, and the plurality of coil end portions include a connection portion connected to the slot accommodating portion and a slot side inclined portion that extends tangentially to the stator core relative to the stator core when viewed in the axial direction and extends axially outward.

[0008] In a stator according to one aspect of the present invention, as described above, the slot-side inclined portions of the coil end portions of the segment coils have tangentially inclined portions, so that when processing the coil end portions of the segment coils, the segment coils can be simply bent in the tangential direction of the stator core, eliminating the need to form the coil end portions of the segment coils into an arc shape along the inner peripheral surface of the stator core. As a result, it is easier to process the portions of the segment coils that correspond to the coil end portions.

[0009] In the stator according to the above aspect, preferably, the slot-side inclined portion is arranged radially outward of the tangential inclined portion when viewed in the axial direction, and further has a normal-side inclined portion inclined toward a normal direction intersecting the direction in which the tangential inclined portion extends.

[0010] With this configuration, the segment coils can be tilted toward the normal direction by the normal-side inclined portion, so that adjacent segment coils can be arranged side by side in the circumferential direction, which prevents adjacent segment coils from overlapping in the axial direction and increasing the axial length.

[0011] In the stator according to the above aspect, preferably, when viewed in the axial direction, the area of ​​the exposed portion of the slot side inclined portion that does not overlap with other adjacent slot side inclined portions is larger than the area of ​​the overlapping portion of the slot side inclined portion that overlaps with other slot side inclined portions.

[0012] With this configuration, the area of ​​the exposed portion is larger than the area of ​​the overlapping portion, thereby increasing the area of ​​the slot-side inclined portion that comes into contact with the outside air, and allowing the heat generated by passing current through the coil to be dissipated efficiently.

[0013] In the stator according to the aforementioned aspect, the exposed portions are preferably configured so that their width increases radially outward as viewed in the axial direction.

[0014] With this configuration, the width increases radially outward, making it easier for heat to dissipate from the outer side than from the inner side in the radial direction. As a result, heat is more easily transferred from the inner periphery of the stator core to the outer side in the radial direction, where heat dissipation is easier, and it is possible to prevent the inner periphery of the stator core from becoming too hot.

[0015] In the stator according to the above aspect, the following configuration is also possible.

[0016] (Additional note 1) In the stator according to the above aspect, when viewed in the axial direction, adjacent slot side inclined portions are arranged so that the inner surface of one slot side inclined portion and the inner surface of the other slot side inclined portion overlap radially rather than being arranged in an arc shape along the circumferential direction.

[0017] By configuring it in this manner, it is not necessary to form adjacent slot-side inclined portions into an arc shape, and the slot-side inclined portions can be arranged side by side in the radial direction, making it easier to process the portion corresponding to the coil end portion of the segment coil.

[0018] (Additional note 2) In a configuration in which the slot-side inclined portion further has a normal-side inclined portion, the coil end portion includes a circumferential inclined portion that extends along the end face of the stator core and inclined radially outward relative to the circumferential direction when viewed in the axial direction, and a crank portion that connects the circumferential inclined portion and the slot-side inclined portion and curves axially outward when viewed in the radial direction.

[0019] With this configuration, the circumferential inclined portion and the crank portion allow the segment coils to be inclined in the radial and axial directions, so that adjacent segment coils can be arranged so as not to overlap with each other in the radial and axial directions. As a result, it is possible to prevent the axial and radial lengths of the entire coil from increasing due to overlapping of the segment coils.

[0020] (Additional note 3) In this case, preferably, the circumferential inclined portion, the normal direction inclined portion, and the crank portion extend linearly in the same radially outward direction when viewed in the axial direction.

[0021] With this configuration, when viewed in the axial direction, the circumferential inclined portion, the normal inclined portion, and the crank portion extend in the same direction, which eliminates the need to bend or twist the segment coil, making it even easier to process the portion corresponding to the coil end portion of the segment coil. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a perspective view showing a stator in the embodiment. [Figure 2] FIG. 2 is a top view of the stator according to the embodiment. [Figure 3]FIG. 2 is an oblique view showing a segment coil in an embodiment. [Figure 4] FIG. 2 is a circuit diagram showing a coil connection configuration in the embodiment. [Figure 5] A diagram showing a segment coil in an embodiment as viewed from the radial direction. [Figure 6] A top view of an enlarged portion of a segment coil in an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] The configuration of a stator according to an embodiment will be described with reference to FIGS.

[0025] (Overall configuration of the stator) The stator 100 shown in FIGS. 1 and 2 constitutes a part of a rotating electric machine (not shown) together with a rotor (not shown) arranged on the R1 side of the stator 100 so as to face the stator 100. The rotating electric machine is, for example, a motor, a generator, or a motor / generator. The stator 100 has a cylindrical shape. A hole through which the rotor is inserted is formed in the center of the stator 100. In the following description, the radial direction of the stator 100 is defined as the R direction, the circumferential direction of the stator 100 is defined as the C direction, and the axial direction in which the rotor is inserted into the stator 100 is defined as the Z direction.

[0026] The stator 100 includes a stator core 1 and a coil 2. The stator 100 is a three-phase AC stator.

[0027] The stator core 1 has a cylindrical shape with a central axis (not shown) along the Z direction. The stator core 1 is formed by stacking a plurality of electromagnetic steel plates (for example, silicon steel plates) in the Z direction.

[0028] The stator core 1 is provided with a plurality of slots 11, which are grooves extending in the Z direction. Coils 2, each consisting of a plurality of segment coils 20, are inserted into the slots 11. The slots 11 are arranged along the circumferential direction on the end face of the stator core 1.

[0029] The coil 2 is formed by joining a plurality of segment coils 20. The plurality of segment coils 20 that make up the coil 2 are made of rectangular wire. As an example, the plurality of segment coils 20 are made of copper wire. The coil 2 is configured to generate magnetic flux when supplied with three-phase AC power from a power supply unit (not shown). The segment coils 20 are arranged (wound) along the circumferential direction of the stator core 1 by moving back and forth through the slots 11 in the Z direction.

[0030] The plurality of segment coils 20 include a U-shaped segment coil 20 and an I-shaped segment coil 20.

[0031] As shown in Figure 3, the U-shaped segment coil 20 includes a pair of slot-accommodated portions 20a that are inserted into the slots 11 of the stator core 1, and a coil end portion 20b that connects the pair of slot-accommodated portions 20a. The multiple segment coils 20 are arranged adjacent to each other. Here, in this specification, "adjacent" means that the two coil end portions are not in contact with each other but are located close to each other.

[0032] 1 and 2, when inserted into the stator core 1, the U-shaped segment coil 20 has coil end portions 20b exposed from one end face in the Z direction of the stator core 1, and both end portions 20c of the segment coil 20 that are not connected by the coil end portions 20b are exposed from the other end face in the Z direction of the stator core 1. The pair of slot accommodating portions 20a are configured so that both end portions 20c are inserted across different slots 11. Furthermore, the end portions 20c of the multiple segment coils 20 exposed from the other end face in the Z direction of the stator core 1 are connected to each other to form one coil 2.

[0033] 2, one coil 2 has an I-shaped segment coil 20 joined to both circumferential ends of a U-shaped segment coil 20. The I-shaped coil forms a connection end portion.

[0034] As shown in FIG. 4, the coils 2 are three-phase coils including a U-phase coil 2U, a V-phase coil 2V, and a W-phase coil 2W. Two sets of coils 2 are arranged for each of the U-phase, V-phase, and W-phase. The coils 2 are connected by a three-phase Y connection. The coils 2 are provided with multiple neutral points N. The U-phase coil 2U is provided with two neutral point connection ends NtU and two power line connection ends PtU. The V-phase coil 2V is provided with two neutral point connection ends NtV and two power line connection ends PtV. The W-phase coil 2W is provided with two neutral point connection ends NtW and two power line connection ends PtW. The power line connection ends PtU, PtV and PtW and the neutral point connection ends NtU, NtV and NtW are arranged on the other axial side (Z2 side) opposite to one side (Z1 side) of the stator core 1 where the connection portion of the U-shaped segment coil 20 is provided.

[0035] 3, the coil end portion 20b has a slot-side inclined portion 21, a circumferential inclined portion 22, and a crank portion 23. The coil end portion 20b also includes a second end portion 24 connected to the circumferential inclined portion 22.

[0036] The slot-side inclined portions 21 cause the segment coils 20 to incline with respect to the end face of the stator core 1, and also incline in a direction away from the end face of the stator core 1 and intersect the axial direction. The slot-side inclined portions 21 also cause the segment coils 20 to incline in the tangential and normal directions. The crank portions 23 cause the segment coils 20 to incline with respect to the end face of the stator core 1, and also incline in a direction away from the end face of the stator core 1 and intersect the axial direction, and the circumferential inclined portions 22 cause the segment coils 20 to extend along the end face of the stator core 1. The other-end portion 24 from the circumferential inclined portion 22 causes the segment coils 20 to incline with respect to the end face of the stator core 1, and also curves in a direction away from the end face of the stator core 1 and intersects the axial direction, and also inclines with respect to the end face of the stator core 1, and then inclines in a direction approaching the end face of the stator core 1 and intersects the axial direction, before extending axially toward the end face of the stator core 1.

[0037] As shown in FIG. 2, the tangential direction is the direction along which a tangent that contacts a point on the inner peripheral surface of the stator core 1 extends. The tangential direction includes a direction perpendicular to the radial direction of the stator core 1 and a direction that is not perpendicular to the radial direction but intersects with it. The normal direction side includes the normal direction in the strict sense, which is a direction perpendicular to the tangential direction, and a direction that is not perpendicular to the tangential direction but intersects with it. The normal direction side includes the same direction as the radial direction.

[0038] 5 and 6, the slot-side inclined portion 21 has a connecting portion 21a, a tangential inclined portion 21b, and a normal-side inclined portion 21c. The slot-side inclined portion 21 is formed in a pentagonal shape when viewed from the axial direction. The slot-side inclined portion may have a polygonal shape other than a pentagonal shape or a triangular shape.

[0039] The connection portion 21a is connected to the slot-accommodated portion 20a. The connection portion 21a is curved in a tangential direction relative to the axial direction. After extending along the axial direction through the slot-accommodated portion 20a, the segment coil 20 is inclined in a tangential direction to the inner circumferential surface 12 of the stator core 1 by the connection portion 21a. The connection portion 21a has an arc shape that protrudes in the circumferential direction when viewed in the radial direction. The inner circumferential surface 12 of the stator core 1 is a surface that forms (surrounds) a hole portion through which the rotor is inserted.

[0040] The tangentially inclined portion 21b is connected to the connection portion 21a. When viewed in the axial direction, the tangentially inclined portion 21b extends in a tangential direction of the stator core 1 relative to the stator core 1. As an example, the tangential direction is the tangential direction of the inner circumferential surface 12 of the stator core 1. When viewed in the radial direction, the tangentially inclined portion 21b extends axially outward (extending in a direction away from the stator core 1). When viewed in the axial direction, the tangentially inclined portion 21b extends radially outward. In circumferentially adjacent segment coils 20, a portion of the lower surface of one tangentially inclined portion 21b and a portion of the upper surface of the other tangentially inclined portion 21b overlap when viewed in the axial direction. Note that the overlapping portion is the portion on the side that is connected to the connection portion 21a. When viewed in the axial direction, the exposed portion 21e of the slot side inclined portion 21 does not overlap with other adjacent slot side inclined portions 21, and the portion of the slot side inclined portion 21 that overlaps with other adjacent slot side inclined portions 21 is called the overlapping portion 21f.

[0041] When viewed in the axial direction, the area A1 of the exposed portion 21e is larger than the area A2 of the overlapping portion 21f. Therefore, there is little overlap between adjacent slot-side inclined portions 21 in the axial direction. In FIG. 6, the area A1 of the exposed portion 21e and the area A2 of the overlapping portion 21f are indicated by different hatching. The overlapping portion 21f is indicated by a dashed line. The exposed portion 21e is a portion formed by combining a part of the tangential inclined portion 21b and the normal-side inclined portion 21c. The overlapping portion 21f is the remaining portion of the tangential inclined portion 21b. When viewed in the axial direction, the exposed portion 21e has a polygonal shape, including a quadrangular shape and a pentagonal shape, but excluding a triangular shape. The overlapping portion 21f is formed in a triangular shape when viewed in the axial direction.

[0042] The exposed portion 21e is configured so that the width W increases toward the radially outer side when viewed in the axial direction. Specifically, the width W of the normal-side inclined portion 21c is greater than the width W of the tangential inclined portion 21b. The width W refers to the length in the radial direction.

[0043] The normal direction side inclined portion 21c is positioned radially outward of the tangential direction inclined portion 21b when viewed in the axial direction. The normal direction side inclined portion 21c is inclined toward the normal direction that intersects with the extension direction of the tangential direction inclined portion 21b. In circumferentially adjacent segment coils 20, the normal direction side inclined portions 21c do not overlap with each other in the axial direction when viewed in the axial direction. Furthermore, in circumferentially adjacent segment coils 20, one normal direction side inclined portion 21c is positioned radially outward of the other normal direction side inclined portion 21c.

[0044] The slot-side inclined portion 21 further includes a bent portion 21d. The bent portion 21d is located between the tangential inclined portion 21b and the normal-side inclined portion 21c. The bent portion 21d bends the slot-side inclined portion 21 radially inward, changing the extension direction of the slot-side inclined portion 21 toward the normal direction. In circumferentially adjacent segment coils 20, the bent portions 21d do not overlap with each other in the axial direction when viewed in the axial direction. In addition, in circumferentially adjacent segment coils 20, one bent portion 21d is located radially outward of the other bent portion 21d. The bent portion 21d is formed linearly when viewed in the axial direction. Note that, for convenience, the boundaries between the tangential inclined portion 21b, the bent portion 21d, and the normal-side inclined portion 21c are indicated by dashed lines in FIG. 6. The tangential inclined portion 21b, the bent portion 21d, and the normal-side inclined portion 21c are integrally formed as a single member.

[0045] When viewed in the axial direction, the area of ​​tangential inclined portion 21b is larger than the area of ​​normal-side inclined portion 21c, which is also larger than the area of ​​bent portion 21d.

[0046] When viewed in the axial direction, adjacent slot-side inclined portions 21 are arranged so that the inner peripheral surface 21g of one slot-side inclined portion 21 and the inner peripheral surface 21g of the other slot-side inclined portion 21 overlap in the radial direction rather than being arranged in an arc shape along the circumferential direction. When viewed in the axial direction, the inner peripheral surfaces 21g that overlap along the circumferential direction are the inner peripheral surfaces of the tangential inclined portions 21b. When viewed in the axial direction, adjacent tangential inclined portions 21b appear to intersect and form corners, so when viewed in the axial direction, the inner peripheral side of the coil 2 appears to be polygonal with the same number of corners as the number of segment coils 20.

[0047] The circumferential inclined portion 22 has a rectangular shape when viewed in the axial and circumferential directions. When viewed in the axial direction, the circumferential inclined portion 22 extends toward the normal direction and also extends radially outward. The circumferential inclined portion 22 is inclined to such an extent that it does not come into contact with adjacent segment coils 20 in the circumferential direction. The circumferential inclined portion 22 is configured to extend along the direction in which the end face of the stator core 1 extends. In other words, the circumferential inclined portion 22 extends along the radial direction. The circumferential inclined portion 22 is formed approximately horizontally when viewed in the radial direction. Preferably, the circumferential inclined portion 22 is configured to extend parallel to the end face of the stator core 1.

[0048] In the adjacent coil end portions 20b, the circumferential inclined portions 22 on one side and the other side do not overlap with each other in the axial direction, and the circumferential side surfaces 22a do not face each other. In the adjacent coil end portions 20b, the circumferential inclined portions 22 on one side and the other side are formed so that their axial lengths from the end face of the stator core 1 are approximately the same. Furthermore, the circumferential inclined portions 22 on one side and the other side extend along the circumferential direction, but they do not need to be parallel to each other, and one may be inclined with respect to the other. Furthermore, the circumferential side surfaces 22a of the circumferential inclined portions 22 on one side and the other side do not need to face each other entirely, as long as they face each other partially. The circumferential inclined portions 22 are arranged so that the circumferential side surfaces 22a face each other adjacently without twisting.

[0049] The crank portion 23 is configured to connect the slot-side inclined portion 21 and the circumferential inclined portion 22. The crank portion 23 is curved outward in the axial direction. The crank portion 23 includes a first curved portion 23a that curves outward in the axial direction and a second curved portion 23b that curves inward in the axial direction, and is S-shaped when viewed from the radial direction. The crank portions 23 of adjacent coil end portions 20b do not overlap with each other in the axial direction or the circumferential direction. The adjacent coil end portions 20b are arranged such that the crank portion 23 and the circumferential inclined portion 22 face each other in the circumferential direction.

[0050] As shown in FIG. 2, the other end portion 24 is connected to the circumferentially inclined portion 22. When viewed radially, the other end portion 24 is inclined in the opposite direction to the slot-side inclined portion 21. More specifically, it is inclined with respect to the axial direction so as to approach the end face of the stator core 1. In addition, of the pair of slot-accommodated portions 20a of the segment coil 20, the other end portion 24 is connected to a slot-accommodated portion 20a that is different from the slot-accommodated portion 20a to which the slot-side inclined portion 21 is connected.

[0051] As shown in Figure 6, when viewed in the axial direction, the circumferential inclined portion 22, the normal-side inclined portion 21c, and the crank portion 23 extend linearly in the same radially outward direction. Therefore, when viewed in the axial direction, the extension directions of the circumferential inclined portion 22, the normal-side inclined portion 21c, and the crank portion 23 are radially outward and normal. Therefore, when viewed in the axial direction, the segment coil 20 is inclined in the tangential direction by the tangential inclined portion 21b, and is inclined toward the normal direction by the circumferential inclined portion 22, the normal-side inclined portion 21c, and the crank portion 23.

[0052] In the adjacent coil end portions 20b, the adjacent segment coils 20 are configured so that the circumferential spacing G increases with increasing distance from the stator core 1. In detail, the spacing G between the slot-side inclined portion 21 of one of the adjacent coil end portions 20b facing each other and the circumferential inclined portion 22 of the other is smallest, and the spacing G between the other end-side portion 24 of one of the adjacent coil end portions 20b facing each other and the other end-side portion 24 of the other is largest.

[0053] The stator 100 is formed by laminating electromagnetic steel sheets to form the stator core 1, and then inserting multiple segment coils 20. By inserting the multiple segment coils 20 into the slots 11, the coil end portions 20b are formed. At this time, the segment coils 20 are inserted into the slots 11 without being twisted. The inserted segment coils 20 are joined together to form the coil 2. The coil 2 is formed by bending the segment coil 20 to form the connection portion 21a and the crank portion 23, bending it in the tangential direction to form the tangentially inclined portion 21b, and bending it in the normal direction to form the normal-side inclined portion 21c.

[0054] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0055] In this embodiment, as described above, the multiple coil end portions 20b include a connecting portion 21a connected to the slot-accommodated portion 20a and a slot-side inclined portion 21 having a tangentially inclined portion 21b that extends tangentially to the inner circumferential surface of the stator core 1 relative to the stator core 1 and extends axially outward when viewed in the axial direction. Thus, since the slot-side inclined portion 21 of the coil end portion 20b of the segment coil 20 has the tangentially inclined portion 21b, when processing the segment coil 20, it is only necessary to bend the segment coil 20 in the tangential direction of the stator core 1, eliminating the need to form the coil end portion 20b of the segment coil 20 into an arc shape along the inner circumferential surface of the stator core 1. This facilitates processing of the portions of the segment coil 20 corresponding to the coil end portions 20b.

[0056] In this embodiment, as described above, the slot-side inclined portion 21 is disposed radially outward of the tangential inclined portion 21b when viewed in the axial direction, and further includes a normal-side inclined portion 21c that is inclined toward the normal direction that intersects with the direction in which the tangential inclined portion 21b extends. This allows the normal-side inclined portion 21c to incline the segment coil 20 toward the normal direction, allowing adjacent segment coils 20 to be arranged side by side in the circumferential direction. As a result, it is possible to prevent adjacent segment coils 20 from overlapping in the axial direction and increasing the axial length.

[0057] In this embodiment, as described above, when viewed in the axial direction, the area A1 of the exposed portion 21e of the slot-side inclined portion 21 that does not overlap with another adjacent slot-side inclined portion 21 is larger than the area A2 of the overlapping portion 21f of the slot-side inclined portion 21 that overlaps with another slot-side inclined portion 21. As a result, the area of ​​the slot-side inclined portion 21 that is in contact with the outside air is increased, and heat generated by passing a current through the coil 2 can be efficiently dissipated.

[0058] In this embodiment, as described above, the exposed portion 21e is configured so that the width W increases radially outward when viewed in the axial direction. As a result, the width W increases radially outward, which makes it easier for heat to dissipate from the radially outer side than from the radially inner side. As a result, heat is more easily transferred from the inner periphery of the stator core 1 to the radially outer side, where heat dissipation is easier, and it is possible to prevent the inner periphery of the stator core 1 from becoming too hot.

[0059] In this embodiment, as described above, when viewed in the axial direction, adjacent slot-side inclined portions 21 are arranged so that the inner peripheral surface 21g of one slot-side inclined portion 21 and the inner peripheral surface 21g of the other slot-side inclined portion 21 overlap in the radial direction rather than being arranged in an arc shape along the circumferential direction. This eliminates the need to form and arrange adjacent slot-side inclined portions 21 in an arc shape, and simply arranges the slot-side inclined portions 21 side by side in the radial direction, making it easier to process the portion corresponding to the coil end portion 20b of the segment coil 20.

[0060] In this embodiment, as described above, the coil end portion 20b includes a circumferentially inclined portion 22 that extends along the end face of the stator core 1 and is inclined radially outward relative to the circumferential direction in an axial view, and a crank portion 23 that connects the circumferentially inclined portion 22 and the slot-side inclined portion 21 and is curved axially outward in a radial view. This allows the circumferentially inclined portion 22 and the crank portion 23 to incline the segment coil 20 in the radial and axial directions, so that adjacent segment coils 20 can be arranged so that they do not overlap in the radial and axial directions. This prevents the axial and radial lengths of the entire coil 2 from increasing due to the segment coils 20 overlapping each other.

[0061] In this embodiment, as described above, the circumferential inclined portion 22, the normal-side inclined portion 21c, and the crank portion 23 extend linearly in the same radially outward direction when viewed in the axial direction. As a result, the circumferential inclined portion 22, the normal-side inclined portion 21c, and the crank portion 23 extend in the same direction when viewed in the axial direction, which eliminates the need to bend or twist the segment coil 20, making it even easier to process the portion of the segment coil 20 corresponding to the coil end portion 20b.

[0062] [Variations] The above-described embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the description of the above-described embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0063] For example, in the above embodiment, the slot-side inclined portion includes a normal-side inclined portion, but the present invention is not limited to this. In the present invention, the slot-side inclined portion does not have to include a normal-side inclined portion.

[0064] In the above embodiment, the connecting portion is curved, but the present invention is not limited to this. In the present invention, the connecting portion may be inclined linearly. In this case, the connecting portion may be inclined in the tangential direction.

[0065] In the above embodiment, the area of ​​the exposed portion is larger than the area of ​​the overlapping portion when viewed in the axial direction, but the present invention is not limited to this. In the present invention, the area of ​​the exposed portion may be equal to or smaller than the area of ​​the overlapping portion.

[0066] In the above embodiment, the exposed portion is configured so that its width increases radially outward as viewed in the axial direction, but the present invention is not limited to this. In the present invention, the width of the exposed portion does not need to change or may decrease radially outward as viewed in the axial direction.

[0067] In the above embodiment, the bent portion is formed linearly when viewed in the axial direction, but the present invention is not limited to this. In the present invention, the bent portion may be formed to be curved or bent when viewed in the axial direction.

[0068] In the above embodiment, the area of ​​the tangentially inclined portion is larger than the area of ​​the normal-side inclined portion when viewed in the axial direction, but the present invention is not limited to this. In the present invention, the area of ​​the tangentially inclined portion when viewed in the axial direction may be smaller than the area of ​​the normal-side inclined portion.

[0069] In the above embodiment, the area of ​​the normal-side inclined portion is larger than the area of ​​the bent portion when viewed in the axial direction, but the present invention is not limited to this. In the present invention, the area of ​​the normal-side inclined portion when viewed in the axial direction may be smaller than the area of ​​the bent portion.

[0070] In the above embodiment, the stator core is a three-phase AC stator, but the present invention is not limited to this. In the present invention, a single-phase AC stator may be used. [Explanation of symbols]

[0071] 1: stator core, 2: coil, 11: slot, 20: segment coil, 20a: slot accommodation portion, 20b: coil end portion, 21: slot side inclined portion, 21a: connection portion, 21b: tangential direction inclined portion, 21c: normal direction side inclined portion, 21e: exposed portion, 21f: overlapping portion, 100: stator

Claims

1. a stator core including slots; a coil including a slot accommodating portion inserted into the slot and a plurality of coil end portions extending axially outward from the end face of the stator core, the coil being made of a rectangular wire and formed by joining a plurality of U-shaped segment coils together; A stator, wherein the plurality of coil end portions include a connection portion connected to the slot accommodating portion, and a slot side inclined portion having a tangential inclined portion that extends tangentially relative to the stator core and extends axially outward when viewed in the axial direction.

2. 2. The stator according to claim 1, wherein the slot-side inclined portion is arranged radially outward of the tangential inclined portion when viewed in the axial direction, and further includes a normal-side inclined portion inclined toward a normal direction intersecting the direction in which the tangential inclined portion extends.

3. 2. The stator according to claim 1, wherein, when viewed in the axial direction, an area of ​​an exposed portion of the slot-side inclined portion that does not overlap with another adjacent slot-side inclined portion is larger than an area of ​​an overlapping portion of the slot-side inclined portion that overlaps with the other slot-side inclined portion.

4. The stator according to claim 3 , wherein the exposed portion is configured so that its width increases toward the radially outer side when viewed in the axial direction.

Images